The MI-T-M 850-0345 Pressure Washer Unloader is used to regulate water pressure and maintain proper water flow in a pressure washer system. It works by redirecting excess water back through the pump when the spray gun is released, helping control pressure and reduce strain on the pump. Replacing a worn or damaged unloader can help restore proper pressure regulation and maintain consis... https://www.wholetoolbox.com/mi-t-m-850-0345-pressure-washer-unloader/850-0345.html